Add mem and obj modules, move to nightly
* mem and obj modules are roughly divided between doing memory-specific things and object-specific things * Box::new_uninit() is a nightly feature and it's quite useful, so I'm enabling that for now * Check out src/obj/attrs.rs for possible undefined behavior in the Attrs::new() function. I'm sure it'll be just fine. Signed-off-by: Alek Ratzloff <alekratz@gmail.com>
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